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Interestingly, the model results suggest that the RER does not correspond to the absolute DELLA levels but appears to reflect the fold change in DELLA as cells traverse the elongation zone (Fig. 3H) \cite{Band2012a}  \subsection{From cell profile at RAM}  The anatomical method for inferring growth rate patterns is laborious and time-consuming relative to marking experiments. However, in cases where the marking experiment would perturb the normal growth rate pattern, the anatomical methods would facilitate reasonable estimates of growth patterns \cite{Silk1989,Bizet2014} \cite{Silk1989}  \cite{Band2012a}